Row adding, some webpack tweaks

app/Tables/BaseNumerator.php

@@ -0,0 +1,76 @@
+<?php
+
+
+namespace App\Tables;
+
+
+abstract class BaseNumerator
+{
+    /** @var int */
+    protected $next;
+
+    /** @var int */
+    protected $last;
+
+    /**
+     * BaseNumerator constructor.
+     *
+     * @param int|int[] $first - first index, or [first, last]
+     * @param int|null $last - last index, or null
+     */
+    public function __construct($first, $last = null)
+    {
+        if (is_array($first) && $last === null) {
+            list($first, $last) = $first;
+        }
+
+        $this->next = $first;
+        $this->last = $last;
+    }
+
+    /**
+     * Get next key, incrementing the internal state
+     *
+     * @return string
+     */
+    public function next()
+    {
+        if (!$this->hasMore())
+            throw new \OutOfBoundsException("Column numerator has run out of allocated GCID slots");
+
+        $key = $this->getKey($this->next);
+        $this->next++;
+        return $key;
+    }
+
+    /**
+     * Convert numeric index to a key
+     *
+     * @param int $index
+     * @return mixed
+     */
+    protected function getKey($index)
+    {
+        return $index; // simple default
+    }
+
+    /**
+     * @return bool - true iof there are more keys available
+     */
+    protected function hasMore()
+    {
+        return $this->next <= $this->last;
+    }
+
+    /**
+     * Generate all keys
+     *
+     * @return \Generator
+     */
+    public function generate()
+    {
+        while ($this->hasMore()) {
+            yield $this->next();
+        }
+    }
+}